<template>
   <div class="code-editor-vue" ref="editor" :style="divStyle" :class="className" > </div>
</template>

<script>
  import ace from 'brace';

  import props from './props';

  const editorOptions = [
    'minLines',
    'maxLines',
    'readOnly',
    'highlightActiveLine',
    'tabSize',
    'enableBasicAutocompletion',
    'enableLiveAutocompletion',
    'enableSnippets',
  ]

  export default {
    props,
    computed: {
      divStyle() {
        const { width, height, style } = this.$props;
        const divStyle = { width, height, ...style };
        return divStyle;
      }
    },
    watch: {
      'mode': function(newVal, oldVal) {
        if (newVal !== oldVal) {
          this.editor.getSession().setMode('ace/mode/' + newVal);
        }
      },
      'theme': function(newVal, oldVal) {
        if (newVal !== oldVal) {
          this.editor.setTheme('ace/theme/' + newVal);
        }
      },
      'fontSize': function(newVal, oldVal) {
        if (newVal !== oldVal) {
          this.editor.setFontSize(newVal);
        }
      },
      'keyboardHandler': function(newVal, oldVal) {
        if (newVal !== oldVal) {
          if (newVal) {
            this.editor.setKeyboardHandler('ace/keyboard/' + newVal);
          } else {
            this.editor.setKeyboardHandler(null);
          }
        }
      },
      'wrapEnabled': function(newVal, oldVal) {
        if (newVal !== oldVal) {
          this.editor.getSession().setUseWrapMode(newVal);
        }
        
        
      },
      'showPrintMargin': function(newVal, oldVal) {
        if (newVal !== oldVal) {
          this.editor.setShowPrintMargin(newVal);
        }
      },
      'showGutter': function(newVal, oldVal) {
        if (newVal !== oldVal) {
          this.editor.renderer.setShowGutter(newVal);
        }
      },
      'setOptions': function(newVal, oldVal) {
        this.handleOptions(this.$props);
      },
      'markers': function(newVal, oldVal) {
        if (Array.isArray(newVal)) {
          this.handleMarkers(newVal);
        }
      },
      'annotations': function(newVal, oldVal) {
        this.editor.getSession().setAnnotations(newVal || []);
      },
      'scrollMargin': function(newVal, oldVal) {
        this.handleScrollMargins(newVal)
      },
      'width': function(newVal, oldVal) {
        if(newVal !== oldVal){
          this.editor.resize();
        }
      },
      'height': function(newVal, oldVal) {
        if(newVal !== oldVal){
          this.editor.resize();
        }
      },
      'focus': function(newVal, oldVal) {
        if (newVal && !oldVal) {
          this.editor.focus();
        }
      },
      'value': function(newVal, oldVal) {
        if (this.editor && this.editor.getValue() !== newVal) {
          this.silent = true;
          const pos = this.editor.session.selection.toJSON();
          this.editor.setValue(newVal);
          this.editor.session.selection.fromJSON(pos);
          this.silent = false;
        }
      },
      '$props': function(newVal, oldVal) {
        for (let i = 0; i < editorOptions.length; i++) {
          const option = editorOptions[i];
          if (newVal[option] !== oldVal[option]) {
            this.editor.setOption(option, newVal[option]);
          }
        }
      },
      deep: true
    },
    mounted() {
      const {
        readonly,
        onBeforeLoad,
        onValidate,
        mode,
        focus,
        theme,
        fontSize,
        value,
        cursorStart,
        showGutter,
        wrapEnabled,
        showPrintMargin,
        scrollMargin,
        keyboardHandler,
        onLoad,
        commands,
        annotations,
        markers,
      } = this.$props;

      this.editor = ace.edit(this.$el);
      
      if (onBeforeLoad) {
        onBeforeLoad(ace);
      }

      const editorProps = Object.keys(this.$props.editorProps);

      for (let i = 0; i < editorProps.length; i++) {
        this.editor[editorProps[i]] = this.$props.editorProps[editorProps[i]];
      }
      if (this.$props.debounceChangePeriod) {
        this.onChangeUpdate = this.debounce(this.onChangeUpdate, this.$props.debounceChangePeriod);
      }
      this.editor.renderer.setScrollMargin(scrollMargin[0], scrollMargin[1], scrollMargin[2], scrollMargin[3])
      this.editor.getSession().setMode(`ace/mode/${mode}`);
      if(readonly===true) this.editor.setReadOnly(true);
      this.editor.setTheme(`ace/theme/${theme}`);
      this.editor.setFontSize(fontSize);
      this.editor.getSession().setValue(value, cursorStart);
      this.editor.navigateFileEnd()
      this.editor.renderer.setShowGutter(showGutter);
      this.editor.getSession().setUseWrapMode(wrapEnabled);
      this.editor.setShowPrintMargin(showPrintMargin);
      this.editor.on('focus', this.onFocusUpdate);
      this.editor.on('blur', this.onBlurUpdate);
      this.editor.on('copy', this.onCopyUpdate);
      this.editor.on('paste', this.onPasteUpdate);
      this.editor.on('change', this.onChangeUpdate);
      this.editor.on('input', this.onInputUpdate);
      this.editor.getSession().selection.on('changeSelection', this.selectionChange);
      this.editor.getSession().selection.on('changeCursor', this.cursorChange);
      // this.editor.getSession().foldAll();
      if (onValidate) {
        this.editor.getSession().on('changeAnnotation', () => {
          const annotations = this.editor.getSession().getAnnotations();
          this.$props.onValidate(annotations);
        });
      }
      this.editor.session.on('changeScrollTop', this.onScrollUpdate);
      this.editor.getSession().setAnnotations(annotations || []);
      if(markers && markers.length > 0){
        this.handleMarkers(markers);
      }

      // get a list of possible options to avoid 'misspelled option errors'
      const availableOptions = this.editor.$options;
      for (let i = 0; i < editorOptions.length; i++) {
        const option = editorOptions[i];
        if (availableOptions.hasOwnProperty(option)) {
          this.editor.setOption(option, this.$props[option]);
        } else if (this.$props[option]) {
          console.warn(`VueAce: editor option ${option} was activated but not found. Did you need to import a related tool or did you possibly mispell the option?`)
        }
      }
      this.handleOptions(this.$props);

      if (Array.isArray(commands)) {
        commands.forEach((command) => {
          if(typeof command.exec == 'string') {
            this.editor.commands.bindKey(command.bindKey, command.exec);
          }
          else {
            this.editor.commands.addCommand(command);
          }
        });
      }

      if (keyboardHandler) {
        this.editor.setKeyboardHandler('ace/keyboard/' + keyboardHandler);
      }

      if (focus) {
        this.editor.focus();
      }

      if (onLoad) {
        onLoad(this.editor);
      }

      this.editor.resize();
    }, // Methods
    methods: {
      debounce(fn, delay) {
        var timer = null;
        return function () {
          var context = this, args = arguments;
          clearTimeout(timer);
          timer = setTimeout(function () {
            fn.apply(context, args);
          }, delay);
        };
      },
      handleScrollMargins(margins = [0, 0, 0, 0]) {
        this.editor.renderer.setScrollMargins(margins[0], margins[1], margins[2], margins[3]);
      },
      onChangeUpdate(event) {
        const value = this.editor.getValue();
        this.$emit('change', value);
      },
      selectionChange(event) {
        if (this.$props.onSelectionChange) {
          const value = this.editor.getSelection();
          this.$props.onSelectionChange(value, event);
        }
      },
      cursorChange(event) {
        if(this.$props.onCursorChange) {
          const value = this.editor.getSelection();
          this.$props.onCursorChange(value, event)
        }
      },
      onInputUpdate(event) {
        const value = this.editor.getValue();
        this.$emit('input', value);
      },
      onFocusUpdate(event) {
        if (this.$props.onFocus) {
          this.$props.onFocus(event);
        }
      },
      onBlurUpdate(event) {
        if (this.$props.onBlur) {
          this.$props.onBlur(event,this.editor);
        }
      },
      onCopyUpdate(text) {
        if (this.$props.onCopy) {
          this.$props.onCopy(text);
        }
      },
      onPasteUpdate(text) {
        if (this.$props.onPaste) {
          this.props.onPaste(text);
        }
      },
      onScrollUpdate() {
        if (this.$props.onScroll) {
          this.$props.onScroll(this.editor);
        }
      },
      handleOptions(props) {
        const setOptions = Object.keys(props.setOptions);
        for (let y = 0; y < setOptions.length; y++) {
          this.editor.setOption(setOptions[y], props.setOptions[setOptions[y]]);
        }
      },
      handleMarkers(markers) {
        // remove foreground markers
        let currentMarkers = this.editor.getSession().getMarkers(true);
        for (const i in currentMarkers) {
          if (currentMarkers.hasOwnProperty(i)) {
            this.editor.getSession().removeMarker(currentMarkers[i].id);
          }
        }
        // remove background markers
        currentMarkers = this.editor.getSession().getMarkers(false);
        for (const i in currentMarkers) {
          if (currentMarkers.hasOwnProperty(i)) {
            this.editor.getSession().removeMarker(currentMarkers[i].id);
          }
        }
        // add new markers
        markers.forEach(({ startRow, startCol, endRow, endCol, className, type, inFront = false }) => {
          const range = new Range(startRow, startCol, endRow, endCol);
          this.editor.getSession().addMarker(range, className, type, inFront);
        });
      },
    },
    beforeDestroy() {
      this.editor.destroy();
      this.editor = null;
    },
  }
</script>
